[NLRS] 432 antenna/ feed questions

[Dave Aho - N9TTX]

1. I know vertically stacked horizontal oriented antennas would be optimal, but would two horizontal yagis be "stacked" effectively next to each other on a cross spreader...and what should the best distance between booms be? 
2. if stacking either horizontal or vertically, what should the phasing harness lengths and feed type be? Or would anyone have one for 432.
Just curious as if I do go out for the UHF test in a couple weeks, and for the Sept test I could put 2 yagis side by side on that band. I only have about 3-4 feet of vertical mast available before I am over legal height on the truck 
I modulate, therefore I am! ...73, and all that jazz, Dave...N9TTX Always remember: "It could be worse.....it could be raining." Marty Feldman from "Young Frankenstein"